Improvement in mill-stone dress



e. & H. OCONNOR.

Millstone Dress.

Patented Nov. 22, 1870.

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GEORGE OGONNOR AND HAlNES OGONNOR, OF MISHAWAKA INDIANA.

Letters PatentNo. 109,542, dated November 22, 1870.

IMPROVEMENT IN MILL-STONE DRESS.

The'Schedule referred to in these Letters Patent: and making part of thesame.

To all whom it may co-ncerar Be it known that we, GEORGE OOonxon andHAINES OCONNOR, of Mishawaka, in the county of St. Joseph and State ot-Indiana, have invented certain new and useful Improvements in Grinding-Mills; and we do hereby declare that the following is a full, clear, andexact descriptionthereoi', reference being had to the accompanyingdrawing and to the letters of referencemarked thereon which .f'orm a Ipart of this specification.

The nature of our invention consists in the construction, arrangement,and operation of two (llSSlilF ilar grinding plates, one stationary andthe other rcvolving upon it, whet-her their surfaces are flat, slightlyconcave, or slightly convex.

In order to enable'others skilled in the' art to which our inventionappertains to make and use the same, we will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure 1 represents the revolving plate;

Figure 2 represents the stationary plate; and

Figure 3 represents the line of action of the grooves in operation.

The revolving plate A is constructed with curvilinear grooves, c 0,running from the inner to the outer edge of the plate, or from a pointback of receiving openings to the outer edge.

From. the receiving opening to this point run a series of ridges, a a,with receivers, b 11; between them.

The stationary plate B is constructed with similar curvilinear groovesff, ridges (Z d, and receivers e a.

The operation in grinding is such that the grooves- '.and ridges crosseach other in action, as shown in fig.

3, and the grain received in the receiving openings is broken andcarried rapidly forward to the point s, when the ridges of the revolvingplate force it across the ridges occupying the remaining space on theouter edge of the stationary plate, thereby producing a great degree ofvfineness in a very small space.

The draft or throwoif capacity obtained by the use of curvilinear ridgesin the revolving plate becomes more eflicient as we near the outer edge,and overcomes all clogging tendencies.

There is also an advantage in the consumption of less power by thusturning" the curves back on the outer edge of the stationary plate.

- The same result is produced by running the grooves in a straight linefrom the point g, fig. 3, to the periphery, making an angle at g.

Having thus fully described our invention,

What we claim as new,-and desire to secure by Letters Patent, is 1. Thecombination of'platcs A 15, when provided with curvilinear grooves c f,said grooves being arranged on the outer circumference of the plates, asand for 'the purpose set forth.

2. The curvilinear grooves c j, in combination with the tangentialridges a (l and receiverse I; on the grinding plates A B, whenconstructed and arranged as shown and described.

In testimony that we claim the foregoing as our own,

we aflix our signatures in-the presence of two witnesscs.

GEORGE OOONNOR.

HAINES OGONN OR.

Witnesses J. H. Wnrrson, A. TERRY.

